Final answer:
The Navy Department Board of Decorations and Medals (NDBDM) was established on April 7, 1964, by SECNAV to advise on recognition and awards in the U.S. Navy and Marine Corps.
Step-by-step explanation:
The Navy Department Board of Decorations and Medals (NDBDM) was established by the Secretary of the Navy (SECNAV) on April 7, 1964.
It was created to advise the Secretary of the Navy on matters related to the recognition and awards of individuals serving in the U.S. Navy and Marine Corps.
The board is responsible for reviewing nominations for medals and decorations, as well as making recommendations for the approval or disapproval of awards.